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111
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1 /* Lower and optimize address expressions.
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2 Copyright (C) 2015-2017 Free Software Foundation, Inc.
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3 Contributed by Marek Polacek <polacek@redhat.com>
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4
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5 This file is part of GCC.
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6
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7 GCC is free software; you can redistribute it and/or modify it under
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8 the terms of the GNU General Public License as published by the Free
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9 Software Foundation; either version 3, or (at your option) any later
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10 version.
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11
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12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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15 for more details.
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16
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17 You should have received a copy of the GNU General Public License
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18 along with GCC; see the file COPYING3. If not see
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19 <http://www.gnu.org/licenses/>. */
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20
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21 #include "config.h"
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22 #include "system.h"
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23 #include "coretypes.h"
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24 #include "alias.h"
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25 #include "predict.h"
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26 #include "tm.h"
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27 #include "function.h"
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28 #include "dominance.h"
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29 #include "cfg.h"
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30 #include "basic-block.h"
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31 #include "tree-ssa-alias.h"
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32 #include "symtab.h"
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33 #include "tree.h"
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34 #include "stringpool.h"
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35 #include "tree-vrp.h"
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36 #include "tree-ssanames.h"
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37 #include "fold-const.h"
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38 #include "gimple-expr.h"
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39 #include "gimple.h"
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40 #include "gimplify.h"
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41 #include "gimple-iterator.h"
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42 #include "gimplify-me.h"
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43 #include "tree-pass.h"
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44
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45
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46 namespace {
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47
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48 const pass_data pass_data_laddress =
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49 {
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50 GIMPLE_PASS, /* type */
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51 "laddress", /* name */
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52 OPTGROUP_NONE, /* optinfo_flags */
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53 TV_GIMPLE_LADDRESS, /* tv_id */
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54 ( PROP_cfg | PROP_ssa ), /* properties_required */
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55 0, /* properties_provided */
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56 0, /* properties_destroyed */
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57 0, /* todo_flags_start */
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58 0, /* todo_flags_finish */
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59 };
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60
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61 class pass_laddress : public gimple_opt_pass
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62 {
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63 public:
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64 pass_laddress (gcc::context *ctxt)
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65 : gimple_opt_pass (pass_data_laddress, ctxt)
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66 {}
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67
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68 /* opt_pass methods: */
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69 opt_pass * clone () { return new pass_laddress (m_ctxt); }
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70 virtual bool gate (function *) { return optimize != 0; }
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71 virtual unsigned int execute (function *);
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72
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73 }; // class pass_laddress
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74
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75 unsigned int
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76 pass_laddress::execute (function *fun)
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77 {
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78 basic_block bb;
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79
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80 FOR_EACH_BB_FN (bb, fun)
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81 {
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82 for (gimple_stmt_iterator gsi = gsi_start_bb (bb); !gsi_end_p (gsi);)
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83 {
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84 gimple *stmt = gsi_stmt (gsi);
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85 if (!is_gimple_assign (stmt)
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86 || gimple_assign_rhs_code (stmt) != ADDR_EXPR
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87 || is_gimple_invariant_address (gimple_assign_rhs1 (stmt)))
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88 {
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89 gsi_next (&gsi);
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90 continue;
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91 }
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92
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93 /* Lower ADDR_EXPR assignments:
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94 _4 = &b[i_9];
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95 into
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96 _1 = (sizetype) i_9;
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97 _7 = _1 * 4;
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98 _4 = &b + _7;
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99 This ought to aid the vectorizer and expose CSE opportunities.
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100 */
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101
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102 tree expr = gimple_assign_rhs1 (stmt);
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103 HOST_WIDE_INT bitsize, bitpos;
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104 tree base, offset;
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105 machine_mode mode;
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106 int volatilep = 0, reversep, unsignedp = 0;
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107 base = get_inner_reference (TREE_OPERAND (expr, 0), &bitsize,
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108 &bitpos, &offset, &mode, &unsignedp,
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109 &reversep, &volatilep);
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110 gcc_assert (base != NULL_TREE && (bitpos % BITS_PER_UNIT) == 0);
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111 if (offset != NULL_TREE)
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112 {
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113 if (bitpos != 0)
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114 offset = size_binop (PLUS_EXPR, offset,
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115 size_int (bitpos / BITS_PER_UNIT));
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116 offset = force_gimple_operand_gsi (&gsi, offset, true, NULL,
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117 true, GSI_SAME_STMT);
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118 base = build_fold_addr_expr (base);
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119 base = force_gimple_operand_gsi (&gsi, base, true, NULL,
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120 true, GSI_SAME_STMT);
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121 gimple *g = gimple_build_assign (gimple_assign_lhs (stmt),
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122 POINTER_PLUS_EXPR, base, offset);
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123 gsi_replace (&gsi, g, false);
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124 }
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125 gsi_next (&gsi);
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126 }
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127 }
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128
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129 return 0;
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130 }
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131
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132 } // anon namespace
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133
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134 gimple_opt_pass *
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135 make_pass_laddress (gcc::context *ctxt)
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136 {
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137 return new pass_laddress (ctxt);
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138 }
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